watchOS 5.1 (build 16R5589c) is an official Apple over-the-air update for the Apple Watch Series 2 (42mm), released on 2018-10-22T17:18:48Z. The update package is 515.37 MB. This is a delta (partial) update that requires 5.0 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: f2852da04e103d1de307a7013073566c0e136df3.zip.